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Assertion & Reason Test: Amines - NEET MCQ


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12 Questions MCQ Test Chemistry Class 12 - Assertion & Reason Test: Amines

Assertion & Reason Test: Amines for NEET 2024 is part of Chemistry Class 12 preparation. The Assertion & Reason Test: Amines questions and answers have been prepared according to the NEET exam syllabus.The Assertion & Reason Test: Amines MCQs are made for NEET 2024 Exam. Find important definitions, questions, notes, meanings, examples, exercises, MCQs and online tests for Assertion & Reason Test: Amines below.
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Assertion & Reason Test: Amines - Question 1

Directions: In the following questions, A statement of Assertion (A) is followed by a statement of Reason (R). Mark the correct choice as.

Assertion (A): Acylation of amines gives a monosubstituted product whereas alkylation of amines gives poly substituted product.

Reason (R): Acyl group sterically hinders the approach of further acyl groups.

Detailed Solution for Assertion & Reason Test: Amines - Question 1
In alkylation, an amine can react with alkyl halide to form next higher class of amine caused by the presence of electron pair on nitrogen which makes amine to behave as nucleophile and alkyl halide thus undergo nucleophilic substitution reaction. When primary and secondary amines react with acid chlorides, anhydrides and esters to give monosubstituted amides as products. Acylation is carried out in the presence of a base stronger than the amine like pyridine which causes the shift of the equilibrium to the right side.
Assertion & Reason Test: Amines - Question 2

Directions: In the following questions, A statement of Assertion (A) is followed by a statement of Reason (R). Mark the correct choice as.

Assertion (A): Aromatic 1° amines can be prepared by Gabriel Phthalimide synthesis.

Reason (R): Aryl halides do not undergo nucleophilic substitution with anion formed by phthalimide.

Detailed Solution for Assertion & Reason Test: Amines - Question 2

Aromatic primary amines cannot be prepared by Gabriel phthalimide synthesis as it  is used for the preparation of aliphatic primary amines and not aromatic primary amines.

When phthalimide is treated with aqueous or ethanolic potassium hydroxide, it forms its potassium salt. This salt, when heated with an alkyl halide and then subjected to alkaline hydrolysis, yields the corresponding primary amine.


Aromatic primary amines cannot be prepared by this method because aryl halides do not undergo nucleophilic substitution with the anion formed by phthalimide.


So, the assertion is wrong.
Reason: 
Aryl halides do not undergo nucleophilic substitution with anion formed by phthalimide.

So, the reason is wrong.

Hence, both assertion and reason are wrong.

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Assertion & Reason Test: Amines - Question 3

Directions: In the following questions, A statement of Assertion (A) is followed by a statement of Reason (R). Mark the correct choice as.

Assertion (A): N, N-Diethylbenzene sulphonamide is insoluble in alkali.

Reason (R): Sulphonyl group attached to nitrogen atom is strong electron withdrawing group.

Detailed Solution for Assertion & Reason Test: Amines - Question 3

Assertion (A) states that N,N-diethylbenzene sulphonamide is insoluble in alkali.

N,N-diethylbenzene sulphonamide has a benzene ring attached to a sulphonamide (SO₂NH) with two ethyl groups on nitrogen. Solubility in alkali typically requires acidic hydrogens to react with OH⁻ ions. However, N,N-diethylbenzene sulphonamide lacks these acidic hydrogens, making it insoluble in alkali.

Hence, Assertion is correct.
Reason (R) states that the sulphonyl group is a strong electron-withdrawing group.

The SO₂ group does withdraw electrons, reducing electron density on nitrogen. However, this electron withdrawal doesn’t directly cause the insolubility; the lack of acidic hydrogen is the main reason.

Hence, Reason is correct but does not explain the assertion.

Assertion & Reason Test: Amines - Question 4

Directions: These questions consist of two statements, each printed as Assertion and Reason. While answering these questions, you are required to choose any one of the following four responses.

Assertion : Nitrating mixture used for carrying out nitration of benzene consists of conc. HNO3+ conc. H2SO4

Reason : In presence of H2SO4, HNO3 acts as a base and produces NO2+ ions.

Detailed Solution for Assertion & Reason Test: Amines - Question 4

The correct option is A If both assertion and reason are true and the reason is the correct explanation of the assertion.
HNO3+2H2SO4⇋ 2HSO4+ NO2++ H3O+

Assertion & Reason Test: Amines - Question 5

Directions: These questions consist of two statements, each printed as Assertion and Reason. While answering these questions, you are required to choose any one of the following four responses.

Assertion : Aniline does not undergo Friedel-Crafts reaction.

Reason : –NH2 group of aniline reacts with AlCl3 (Lewis acid) to give acid-base reaction.

Detailed Solution for Assertion & Reason Test: Amines - Question 5
Aniline does not undergo Friedel craft's reactions because the reagent AlCl3 ​ (the Lewis acid which is used as a catalyst in friedel crafts reaction), being electron deficient acts as a Lewis base. and attacks on the lone pair of nitrogen present in aniline to form an insoluble complex which precipitates out and the reaction does not proceed.
Assertion & Reason Test: Amines - Question 6

Directions: These questions consist of two statements, each printed as Assertion and Reason. While answering these questions, you are required to choose any one of the following four responses.

Assertion : Nitration of aniline can be conveniently done by protecting the amino group by acetylation.

Reason : Acetylation increases the electron-density in the benzene ring.

Detailed Solution for Assertion & Reason Test: Amines - Question 6
Acetylation decreases the electron-density in the benzene ring thereby preventing oxidation.
Assertion & Reason Test: Amines - Question 7

Directions: These questions consist of two statements, each printed as Assertion and Reason. While answering these questions, you are required to choose any one of the following four responses.

Assertion : Acetanilide is less basic than aniline.

Reason : Acetylation of aniline results in decrease of electron density on nitrogen.

Detailed Solution for Assertion & Reason Test: Amines - Question 7

Assertion & Reason Test: Amines - Question 8

Directions: These questions consist of two statements, each printed as Assertion and Reason. While answering these questions, you are required to choose any one of the following four responses.

Assertion : Amines are basic in nature.

Reason : Amines have lone pair of electrons on nitrogen atom.

Detailed Solution for Assertion & Reason Test: Amines - Question 8
Amines are basic due to the presence of a lone pair of electrons on nitrogen atom. The lone pair can be easily donated.
Assertion & Reason Test: Amines - Question 9

Directions: These questions consist of two statements, each printed as Assertion and Reason. While answering these questions, you are required to choose any one of the following four responses.

Assertion : Only a small amount of HCl is required in the reduction of nitro compounds with iron scrap and HCl in the presence of steam.

Reason : FeCl2 formed gets hydrolysed to release HCl during the reaction.

Detailed Solution for Assertion & Reason Test: Amines - Question 9

Only a small amount of HCl is needed to reduce nitro compounds to amines using iron scrap and HCl with steam. This is because FeCl₂, formed during the reaction, undergoes hydrolysis, releasing hydrochloric acid that can then sustain the reaction.

Fe + 2HCl → FeCl2 + H2

With Steam

FeCl2 + H2O(g) → Fe(OH)2 + 2HCl

Reason:

FeCl2 formed gets hydrolyzed and releases HCl during the reaction.
So, it can be used further in the reaction. So, the Reason is a correct statement and it explains the assertion.

Hence,  Both assertion and reason are correct statements and reason is the correct explanation of assertion.

Assertion & Reason Test: Amines - Question 10

Directions: In the following questions, A statement of Assertion (A) is followed by a statement of Reason (R). Mark the correct choice as.

Assertion: Hoffmann's bromamide reaction is given by primary amines.
Reason: Primary amines are more basic than secondary amines.

Detailed Solution for Assertion & Reason Test: Amines - Question 10

The Hoffmann bromamide degradation reaction prepares primary amines by treating an amide with bromine in an aqueous or ethanolic sodium hydroxide solution. The resulting amine has one carbon atom less than the original amide.

Therefore, the assertion is incorrect because Hoffmann’s bromamide reaction involves amides rather than primary amines, even though the product is a primary amine.

Reason:
Primary amines are less basic than secondary amines because secondary amines have more electron-donating alkyl groups, which enhance their basicity. Thus, the reason statement is also incorrect.

Consequently, both the assertion and reason are wrong.

Assertion & Reason Test: Amines - Question 11

Directions: These questions consist of two statements, each printed as Assertion and Reason. While answering these questions, you are required to choose any one of the following four responses.

Assertion (A): --NH2 group is o- and p-directing in electrophilic substitution reactions

Reason (R): Aniline cannot undergo Friedel-Crafts reaction

Detailed Solution for Assertion & Reason Test: Amines - Question 11

-NH2  is o- and p- directing in electrophilic substitution reactions due to excess of electron or negative charge over o- and p- positions because of its various resonating Structures. 

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Aniline cannot undergo a Friedel-Crafts reaction because its amino group (-NH₂) donates electrons to the benzene ring, making it highly reactive. However, this same amino group also reacts with the Lewis acid catalyst (like AlCl₃), inhibiting the reaction. Thus, while Friedel-Crafts is indeed an electrophilic substitution reaction, this alone doesn’t explain aniline's lack of reactivity.

Both the assertion and reason are correct, but the reason does not explain the assertion.

Assertion & Reason Test: Amines - Question 12

Directions: In the following questions, A statement of Assertion (A) is followed by a statement of Reason (R). Mark the correct choice as..

Assertion (A): Monobromination of aniline can be conveniently done by protecting the amino group by acetylation.
Reason (R): Acetylation of aniline results in the increase of electron density at the benzene ring.

Detailed Solution for Assertion & Reason Test: Amines - Question 12

In the reaction, the NH₂ group is protected by an acetyl group because it is highly reactive due to the lone pair on the nitrogen in aniline. The incoming NO₂ group tends to accept this lone pair effectively. Therefore, acetylation of the NH₂ group is performed to reduce its reactivity towards the incoming NO₂ group.

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